Alfa Romeo GT - SQ build - HELIX/HAT/JBL GTI/BRAX/CROWN by LBaudio

L

LBaudio

Noob
[FONT=&quot]Hey Guys![/FONT]
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[FONT=&quot]Im starting with new personal SQ build in Alfa Romeo GT.[/FONT]
[FONT=&quot]Equipment list:[/FONT]
[FONT=&quot]Source:[/FONT]
[FONT=&quot]- undecided, probably modded Clarion HX or Pioneer ODR as CD transport + digital player or tablet[/FONT]
[FONT=&quot]Front system[/FONT]

  • Midbas - 2 pairs JBL C660 GTI in ported doorpanel enclosures
  • Midrange - Hybrid Audio Technologies L4SE (optional JBL 400 GTI)
  • Tweeter - JBL TC 25 Titanium
[FONT=&quot]Subs:[/FONT]
[FONT=&quot]- 2 x JBL W15 GTI (probably in sealed enclosure due to space limitations)[/FONT]
[FONT=&quot]Processor:[/FONT]
[FONT=&quot]-Helix DSP Pro[/FONT]
[FONT=&quot]Amps:[/FONT]
[FONT=&quot]- Brax X2000 and X2400[/FONT]
[FONT=&quot]-JBL/CROWN BPX2200.1[/FONT]
[FONT=&quot]Cables:[/FONT]
[FONT=&quot]Acessories: Audison fuse blocks, Brax voltmeters, Brax IPC1F + 2 x 2F, Helix Power Station[/FONT]
[FONT=&quot]DLS, Dietz twisted and shielded, QED Silver Anniversary bi-amping, Kimber, Esoteric audio.[/FONT]
[FONT=&quot]Damping[/FONT]
[FONT=&quot]- Silent coat[/FONT]
[FONT=&quot]A couple of pics of car:[/FONT]
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[FONT=&quot]I started with build of a-pillars[/FONT]
[FONT=&quot]rings were cut on CNC and then chamfered behind the driver cutout and also in front.[/FONT]
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[FONT=&quot]T-nuts were added[/FONT]
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[FONT=&quot]Terrter will be held by neo magnets - 4 pc for each tweet[/FONT]
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[FONT=&quot]Before start, rings were soaked with poliester resin. This asure that bond with filler and MDF will be as strong as possible and wont crack where two materials meet.[/FONT]
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[FONT=&quot]Original upholstery material was stripped down from pillars. Pillars were sanded, drilled a bunch of holes in and covered in three layers of rowing/mat and trimmed.[/FONT]
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[FONT=&quot]taped off back side of pillar[/FONT]
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[FONT=&quot]after fiberglass was applied[/FONT]
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[FONT=&quot]back side of pillar will recieve additional layer of fiberglass to create a Sanwich of Fiberglass/ABS/Fiberglass[/FONT]
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[FONT=&quot]a part of pillar at the bottom is without fiberglass applyed[/FONT]
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[FONT=&quot]next stage in pillar fabrication was to create molds of the dash, which will serve as bottom part of the enclosure.[/FONT]
[FONT=&quot]Car was protected with alu tape and painters tape.....[/FONT]
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[FONT=&quot]pulled out of the car and trimmed[/FONT]
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[FONT=&quot]Drawn some lines for design and ventilation opening[/FONT]
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[FONT=&quot]Made a template for shape of this bottom part[/FONT]
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[FONT=&quot]Next task was to mold together this bottom part and pillar[/FONT]
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[FONT=&quot]A mix or resin and filler with strands were used to make milkshake which was used to "glue" this two parts together[/FONT]
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[FONT=&quot]Large opening on the pillar was created to obtain enough unobstructed air-flow for midrange to vent under the dash. All original pillar fastening spots were preserved[/FONT]
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[FONT=&quot]Rings positioned and secured in place[/FONT]
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[FONT=&quot]Now fun with designing begins[/FONT]
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[FONT=&quot]Inside walls were all smoothed out[/FONT]
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[FONT=&quot]design arround ventilation opening[/FONT]
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[FONT=&quot]And closed[/FONT]
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[FONT=&quot]test fit in car - basic shape is done, now I need to make them symmetryc and smooth [/FONT]
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[FONT=&quot]This is where Im at at the moment,... Will post new pics as I progress[/FONT]
 
Great to see you posting your latest work, your fab is always top notch.

I'm curious if you spent much time with aiming and and placement. Well that's a dumb statement I know you would have done due diligence on everything but there's been a lot of chatter about tweeter placement and side window reflections just wondering what artifacts you may have noticed.

No need to spoil the surprise, but I'm almost fearful of what you're going to build for door panels on this one.
 
Thanhks for nice comments to both of you!
To be honest I didnt had mauch other options regarding positioning and aiming due to space restrictions. First option was of course vertical aligment as always, but unfortunately undoable in my case. I struggled with 3 focal mid and TBE in friends AR GT and hardly managed to set them in vertical aligment,...in my case with 4" mid and huge tweeter it wasnt possible. I just payed attention to height of the stage, width and I tryed to avoid cluster hump as much as possible, everything else will be BIG surprise when I start to tune:snap::snap::hmm::dunno:.... but it is a long way in frront of me before this will happen.
The doors will remain the same - will reuse them from previous car - both cars share the same doorpanels...lucky me, lol, but will post pics of the fabrication anyways, so build thread is somehow complete with all pics of fabrication, and for those who are not familiar with my previous install to understand why I opted for exact design of pillars.
 
I just want to say fantastic craftsmanship and the only thing that bothers me is you are too far away to build mine. :)
 
avidedtr said:
That tweeter was a fav of mine growing up. Beautiful craftsmanship.
Click to expand...

Thank you for your comment Avidedtr!
We tested this tweeters against a lot of top tier tweeters like Morel Supremo, Picollo, Brax, Microprecision-7, JBL C660 GTI, Pioneer ODR, .... and those JBL TC25 stood out, really only comparable to them was Pioneer ODR set. I love them, and I have a spare pair in the closet :D:peace:
 
dgage said:
I just want to say fantastic craftsmanship and the only thing that bothers me is you are too far away to build mine. :)
Click to expand...

Thank you,.... If I have lived closer to you, I would be glad to fab set for you!..... it would be doable if I would have acces to the same car as you have, but shipping would be somewhere in 100-150USD....
 
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As promised, here are the pics of doorpanel build... those doors were fabricated for previous car, but since they fit to newer car I will reuse them since they perform very good. The panels were made for two pairs of JBL C660 GTI midbass drivers. Approx volume is 20 litre. They were made in a manner that I can retune them or convert them to sealed with ease......onto the pics:

first I started with template for speaker baffle

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Started to make duplicates
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test fit
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